今天生产环境tomcat启动后，用户登录时系统报错：java.sql.SQLException: 不能在 UTF8 和 UCS2 之间转换: failUTF8Conv
经确认数据库、程序、TOMCAT均未进行示改动。
在网上查询有说是oracle jdbc驱动的问题，但我本地使用ojdbc14.jar的驱动仍不行，
参考：http://blog.csdn.net/dacong910/article/details/5432245
本地程序连生产环境数据库调试：
DBCP borrowObject failed: java.sql.SQLException: 不能在 UTF8 和 UCS2 之间转换: failUTF8Conv DBCP borrowObject failed: java.sql.SQLException: 不能在 UTF8 和 UCS2 之间转换: failUTF8Conv DBCP borrowObject failed: java.sql.SQLException: 不能在 UTF8 和 UCS2 之间转换: failUTF8Conv org.apache.commons.dbcp.DbcpException: java.sql.SQLException: 不能在 UTF8 和 UCS2 之间转换: failUTF8Conv at org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:85) at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:184) at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:722) at org.apache.commons.dbcp.AbandonedObjectPool.borrowObject(AbandonedObjectPool.java:117) at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:108) at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:312) at com.eclink.util.DBUtil.getNewConnection(DBUtil.java:160) at com.eclink.util.DBUtil.<init>(DBUtil.java:133) at com.eclink.util.DBUtil.<init>(DBUtil.java:99) at com.eclink.dectr.model.sys.OfficePostDAO.getUserInfo(OfficePostDAO.java:93) at com.eclink.dectr.controller.sys.LogonValidatorAction.login(LogonValidatorAction.java:72) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:280) at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:216) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1480) at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:524) at javax.servlet.http.HttpServlet.service(HttpServlet.java:763) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204) at com.eclink.dectr.filter.ActionFilter.doFilter(ActionFilter.java:84) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:233) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204) at com.eclink.dectr.filter.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:110) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:233) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567) at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:199) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:184) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972) at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:833) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:732) at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:619) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:688) at java.lang.Thread.run(Thread.java:534) Caused by: java.sql.SQLException: 不能在 UTF8 和 UCS2 之间转换: failUTF8Conv at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179) at oracle.jdbc.dbaccess.DBError.check_error(DBError.java:1130) at oracle.jdbc.dbaccess.DBConversion.failUTF8Conv(DBConversion.java:2261) at oracle.jdbc.dbaccess.DBConversion.utf8BytesToJavaChars(DBConversion.java:2061) at oracle.jdbc.dbaccess.DBConversion.utf8BytesToString(DBConversion.java:1976) at oracle.jdbc.dbaccess.DBConversion.CharBytesToString(DBConversion.java:543) at oracle.jdbc.ttc7.TTIoer.processWarning(TTIoer.java:334) at oracle.jdbc.ttc7.O3log.receive2nd(O3log.java:523) at oracle.jdbc.ttc7.TTC7Protocol.logon(TTC7Protocol.java:278) at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:346) at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:468) at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:314) at org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:83) ... 52 more DBCP borrowObject failed: java.sql.SQLException: 不能在 UTF8 和 UCS2 之间转换: failUTF8Conv
发现具体异常是DBCP组件里面抛出来的，参考文章中有一句话：
“后话：应该是因为数据库的密码策略，增加了一步校验的功能，而老驱动则不能识别这个校验；”
刚好我发现，当使用plsql dev连接生产环境时会提示密码即将过期，询问是否要修改密码。于是诊断应该是这个密码校验引起的，将数据库修改一下，再改回来，重启TOMCAT，应用正常。